64120440 has 64 divisors (see below), whose sum is σ = 202492800. Its totient is φ = 16198272.

The previous prime is 64120409. The next prime is 64120453. The reversal of 64120440 is 4402146.

It is a super-2 number, since 2×64120440² = 8222861651587200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11782 + ... + 16341.

It is an arithmetic number, because the mean of its divisors is an integer number (3163950).

Almost surely, 2^64120440 is an apocalyptic number.

64120440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64120440 is an abundant number, since it is smaller than the sum of its proper divisors (138372360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64120440 is a wasteful number, since it uses less digits than its factorization.

64120440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28156 (or 28152 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 64120440 is about 8007.5239618749. The cubic root of 64120440 is about 400.2507594331.

Adding to 64120440 its reverse (4402146), we get a palindrome (68522586).

The spelling of 64120440 in words is "sixty-four million, one hundred twenty thousand, four hundred forty".